BAT大佬推荐使用的HTML5的十个功能,web开发问题
HTML5 提供了许多强大的新功能,使得 Web 开发更加容易和富有表现力。以下是一些最常用的 HTML5 功能:
- 用于绘图的
<canvas>
元素
<canvas id="myCanvas" width="200" height="100"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#FF0000';
ctx.fillRect(0, 0, 150, 75);
</script>
- 本地存储(LocalStorage/SessionStorage)
localStorage.setItem('key', 'value');
var data = localStorage.getItem('key');
- 音频和视频支持
<audio controls>
<source src="horse.ogg" type="audio/ogg">
<source src="horse.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>
<video width="320" height="240" controls>
<source src="movie.mp4" type="video/mp4">
<source src="movie.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
- 新的表单输入类型(如email, url, number, range, date, datetime, datetime-local, month, week, time, search, color)
<form>
Email: <input type="email" name="user_email">
URL: <input type="url" name="user_url">
Number: <input type="number" name="user_number" min="1" max="5" step="1">
Range: <input type="range" name="user_range" min="1" max="10">
Search: <input type="search" name="user_search">
Color: <input type="color" name="user_color">
<input type="submit">
</form>
- 内置 SVG 支持
<svg width="100" height="100">
<circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" />
</svg>
- 新的通信API:WebSockets
var ws = new WebSocket('ws://localhost:80/');
ws.onopen = function() {
ws.send('Hello Server');
};
ws.onmessage = function(evt) {
console.log(evt.data);
};
ws.onclose = function(evt) {
console.log('WebSocket closed');
};
ws.onerror = function(evt) {
console.error('WebSocket error observed:', evt);
};
- 地理位置(Geolocation)API
navigator.geolocation.getCurrentPosition(function(position) {
console.log("Latitude: " + position.coords.latitude +
" Longitude: " + position.coords.longitude);
});
- 应用程序缓存(Application Cache)
<!DOCTYPE html>
<html manifest="example.appcache">
<!-- your web app content -->
</html>
- 内容可编辑(ContentEditable)
<div contenteditable="true">
This is a editable area.
</div>
- Drag and Drop API
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